17908

: :.

ANSI/ASM E 831.3

Interpretations No.4'(This supplement is not part of ANSI/ASME B31.3 or its Addenda and is included for information only.!

It has been agreed to publish interpretations issued by the B31 Committee concerning B31.3 aspart of the subscription service. This supplement includes interpretations concerning B31.3 issuedbetween January 1, 1985 and August 31, 1986. They have been assigned interpretation numbers inchronological order. Each interpretation applies to the latest Edition or Addenda at the time of issuanceof the interpretation or the Edition or Addenda stated in the reply. Subsequent revisions to the Codemay have superseded the reply.

These replies are taken verbatim from the original letters, except for a few typographical andeditorial corrections made for the purpose of improved clarity, In some instances, a review of theinterpretation revealed a need' for corrections of a technical nature. In these cases, a revised reply,bearing the original interpretation number with the suffix R, is presented.

ASME procedures provide for reconsideration of these interpretations when or if additional information is available which the inquirer belives might affect the interpretation. Further, persons aggrievedby an interpretation may appeal to the cognizant ASME committee or subcommittee. As stated in theStatement of Policy in the Code documents, ASME does not "approve," "certify," "rate," or "endorse" any item, construction, proprietary device, or activity.

27

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B31.3

Subject

300(b) Responsibility for Categorizing Fluid Services .301.5.3 .302.2.4<0(1) and 301.3.2(b)(4) .304.3.2 .Table 323.2.2 .Table 323.2.2 .327.4.4(d)(2) .327.S.Hdl and 327.5.2 .329 .331.3.6(bl .337.4 .337.5.1 (b)(I)(bl .Allowable Stresses ................•.......................................8ranch Connection .Flexibility and Stress Intensity Factors .limitations on Temperature and Materials for Category 0 Fluid Services .Longitudinal Stresses, 302.3.5(c), and Corrosion .Scope, Hot, Oil Heating System Piping .Welding of'ASTM 8 337 .

Interpretation

4-084-074-114-054-014-154-034-174-024-064-044-094-124-144-164-134-104-194-18

File No.

831-85-003831-84-037831-85-001831-84-033831-84-028831-85-022831-84-031831-85-031831-84-029831-84-035831-84-032831-85-008831-85-002831·85-021831-85-024831-85-011831-84-038831-86·007831-85-033

29

831.3 Interpretations NO.4

Interpretation: 4-01

4-01, 4-02,4-03

Subject:

Date Issued:

File:

Table 323.2.2

january 11, 1985

B31-84-028

Question: In Table 323.2.2, Column B, Box 2 of ANSI/ASME B31.3, does "material" in the firstparagraph refer to base l11etal?

Reply: Yes.


Subject:

Date Issued:

File:

329

january 11, 1985

B31-84-029

Question: When piping which otherwise does not require heat treatment is straightened byheating, do the requirements for bending in 329 of ANSI/ASME B31.3 apply?

Reply: Yes.


Subject:

Date Issued:

File:

327.4.4(d)(2) ,

january 11, 1985

B31-84-031

Question: 327.4.4(d)(2) of ANSI/ASME B31.3 states: "If the weld joining the added reinforcementto the branch is a fillet weld, the throat dimension shall not be less than O.7tmin [see Fig. 327.4.40 sketch(5»)." If the reinforcement is shaped as in Fig. 327.4.40 sketch (3) rather than the Fig. 327.4.40 sketch(5) referenced, and is attached to the branch by a fillet weld only, is the O.7tmin throat applicable?

Reply: Yes, provided that the requirements of 304.3.3, including proper attachment, are satisfied.

31

4-04 831.3 Interpretations NO.4


Subject:

Date Issued:

File:

33704

January 11, 1985

631-84-032

32

Question (1): Is it required to consider the static head pressure of the fluid when determining thereduction of the minimum hydrostatic gage pressure required by 337A.Hb) of ANSI/ASME 631.3 tothe maximum pressure that will not exceed the yield strength as allowed ,by 337A.Hc)?

Reply (1): Yes.

Question (2): If the combined pressure of static head of the test fluid during pressure testing andthe test pressure will produce a stress in excess of the yield strength of the material being pressuretested, may the piping system be excluded from pressure testing?

Reply (2): No (see 337.1).

(

B31.3 Interpretations No. 4


4-05

Subject:

Date Issued:

File:

304.3.2

January 11, 1985

631-84-033

Question (1): What does the ANSIIASM E 631.3 Code mean by the term "integrally reinforcedbranch connection fitting"?

Reply (1): An integrally reinforced branch connectio~ fitting is a fitting in which the pressureretaining strength of the branch connection assembly is provided by the material within the fitting itselfand when attached as recommended by the manufacturer.

Question (2): How does one ascertain if a commercially available welding outlet fitting meets theabove description of an integrally reinforced branch connection fitting?

Reply (2): It is the designer's responsibility to determine the adequacy of the manufacturer'scomponent based on the rules of the Code.

Question (3): Does an integrally reinforced branch connection fitting as described in 304.3.2(c)also include fittings with flanged outlets?

Reply (3): Such fittings are permitted provided that the reinforcement and other design featuresmeet the requirements of the Code.

Question (4): Who is responsible for assuring compliance with the testing provisions of 304.3.2of ANSI I ASM E 631.3 when required?

Reply (4): The designer is responsible to the owner for assurance that the engineering design ofthe piping complies with the requirements of this Code. See 300(b)(2).

Question (5): Can it be assumed, without calculation, that a long weldneck flange has adequatepressure strength as described in 304.3.2?

Reply (5): No. Calculations are required by 304.7.2 to qualify the design in accordance with304.3.2(C). However, once the design has been qualified in accordance with 304.7.2, calculationsneed not be made for every branch connection. As stated in 304.7.2 "reasonable interpolationsbetween sizes, pressure classes, and wall thickness and reasonable analogies among related materials,are permitted."

33

4-06, 4-07, 4-08


B31.3 Interpretations No.4

Subject:

Date Issued:

File:

331.3.6(bl

January 11, 1985

B31-84-035

Question: Is it permissible to apply the exclusions in 331.3.6(bl of ANSI/ASME B31.3 to nonpressure attachment welds other than fillet welds?

Reply: No.


Subject:

Date Issued:

File:

301.5.3

April 9, 1985

B31-84-037

Question: Does 301.5.3 of ANSI/ASME B31.3 require that all piping systems be designed forearthquake induced horizontal forces?

Reply: Yes.


Subject:

Date Issued:

File:

300(bl Responsibility for Categorizing Fluid Services

April 9, 1985

B31-85-003

Question: As defined in ANSIIASME B31.3, is it the responsibility of the designer to classify fluidservices as Category D or Category M?

Reply: No, the designer can recommend to the owner but the ultimate responsibility for identifyingthese fluid services rests with the owner. See 300(b)(1).

34

831.3 Interpretations No. 4


4-09,4-10'

Subject:

Date Issued:

File:

337.5.1 (b)(l )(b)

April 9, 1985

B31-85-008

Question: Does 337.5.Hb)(1)(b) of ANSI/ASME B31.3 require liquid penetrant or magnetic particle examination of butt welds which have been 100% radiographed in accordance with337.5.1 (b)(l )(a)?

Reply: Yes.


Subject:

Date Issued:

File:

Longitudinal Stresses, 302.3.5(c), and Corrosion

May 8, 1985

B31-84-038

~' . \ ~

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............:.:

Question (1): In 302.3.5(c) of ANSI/ASME B31.3, does longitudinal stress include sustainedstresses due to axial loads?

Reply (1): Yes.

Question (2): When computing longitudinal stress in accordance with 302.3.5(c), is it required tobase the applied pipe weight on the nominal wall thickness and stress on the corroded thickness ofthe pipe?

Reply (2): No; however, 300(c)(3) states in part that the Code generally employs a simplifiedapproach and 300(c)(5) requires unusual service requirements to be specified in the engineering design.

Question (3): For thermal flexibility analysis in accordance with 319, is it required to determinestresses by applying the forces and moments produced by pipe of nominal wall thickness to the pipesection in the corroded condition?

Reply (3): No. Nominal wall thickness shall be used in flexibility calculations. Refer to 319.3.5,300(c)(3), and 300(c)(5l.

3S

4-11,4-12


631.3 Interpretations NO.4

Subject:

Date Issued:

File:

302.2.4(0(1) and 301.3.2(b)(4)

May 8, 1985

B31-85-001

Question (1): For occasional variations in pressure or temperature above operating levels, is itpermissible to exceed the pressure rating or the allowable stress for pressure design at the temperatureof the increased condition by up to 33%, provided that all of the requirements of 302.2.4 ofANSI/ASME B31.3 are met?

Reply (1): Yes.

Question (2): Do the percentage temperature reduction provisions in 301.3.2 apply to the absolute temperature scales as well as the Fahrenheit and Celsius scales?

Reply (2): No. The percent temperature reductions only apply to the Fahrenheit and Celsius scales.


Subject: Allowable Stresses

Date Issued: May 8, 1985

(File: B31-85-002

Question (l): For the pressure design of longitudinal or spiral welded pipe under internal pressure,a value for Sf is required. Is the correct value of Sf to be used in 304.1.2 of ANSI/ASME B31.3 thatvalue listed in Appendix A, Table A-1, under the pipe material specification and grade?

Reply (l): Yes.

Question (2): For the determination of the allowable longitudinal stress for circumferential weldsin accordance with 302.3.5, is it required to apply a weld joint quality factor?

Reply (2): No.

Question (3): Do the random examination percentages required by ANSI/ASME B31.3 apply toeach fabricator, manufacturer, and erector individually?

Reply (3): Yes.

(, •...','',.:

36

B31.3 Interpretations No.4


4-13, 4-14, 4-15 :

Subject:

Date Issued:

File:

Limitations on Temperature and Materials for Category DFluid Service

May 8, 1985

B31-85-011

Question (1): In accordance with ANSI/ ASME B31.3, what is the uppenemperature limitation ofASTM A 671, Grade CB70 pipe with stiffener rings manufactured from ASTM A 36 plate?

Reply (1): It is 750"F for the ASTM A 36 stiffener rings.

Question (2): Is the material combination limited to Category D fluid service?

Reply (2): No.


Subject:

Date Issued:

File:

Branch Connection

August 29, 1985

B31-85-021

Question: Maya welded branch connection fitting of the design illustrated in Fig. 127.4.8(F) ofANSI/ASME B31.1 be used in ANSI/ASME B31.3 construction?

Reply: Yes, provided t w meets the requirements for reinforcement in ANSI/ASME 831.1. Theweld shown in Fig. 127.4.8(F) is considered to be a full penetration weld with integral backing.


Subject:

Date Issued:

File:

Table 323.2.2

October 25, 1985

B31-85-022

\

T· .... ". '.',.':;, "...L".

Question: When ASTM A 193 Gr B7 bolting material is furnished in the quenched and temperedcondition and is to be used at temperatures below - 20"F through - 50"F, is it required that the materialbe impact tested?

Reply: No.

37

4-16,4-17


831.3 Interpretations No.4

Subject:

Date Issued:

File:

Flexibility and Stress Intensity Factors·

January 29, 1986

B31-85-024

Question (1): Table 0-1 of ANSI/ASME B31.3 gives flexibility and stress intensification factors foran unreinforced fabricated tee. Are these flexibility and stress intensification factors applicable to botha "stub-in" unreinforcecJ fabricated tee as illustrated in Fig. 327.4.40 sketch (2) and a "stub-in" teeas illustrated in Fig. 327.4.40 sketch (ll? .

Reply (1): Yes.

Question (2): Table 0-1 gives flexibility and stress intensification factors for a reinforced fabricatedtee with pad or saddle. Are these flexibility and stress intensification factors applicable to both a"stub-in" reinforced fabricated tee with pad or saddle as illustrated in Fig. 327.4.40 sketch (4) anda "stub-on" tee as illustrated in Fig. 327.4.40 sketch (3)?

Reply (2): Yes.


Subject:

Date Issued:

File:

327.5.Hd) and 327.5.2

January 29, 1986

B31-85-031

cQuestion (1): When qualifying welding procedures which require impact testing, is the basic

qualified thickness range Y2t to t + Y. in. rather than the range given in Section IX of the ASME Boilerand Pressure Vessel Code of the lesser of S/8 in., and t to 2t as in QW-403.6 (where t is thickness oftest coupon)?

Reply (1): Yes.

Question (2): Is the fact that P-Numbers in Appendix A are not further divided into GroupNumbers, similar to Section IX, QW-422, to be interpretated that the Group Numbers of Section IXneed not be considered when qualifying welding procedures to Section IX for impact tested ·materials?

Reply (2): No. (See Column A of Table 323.3.1.)

38

tr.. 'O.

~

831.3 Interpretations No.4


4-18, 4-19

Subject:

Date Issued:

File:

Welding of ASTM B 337

January 29, 1986

B31-85-033

Question (1): In Table A-1 of ANSI/ ASME B31.3, Note (17) is referenced for ASTM B 337unalloyed titanium pipe. Is it intended to require welding without use of filler metal for all sizes andwall thicknesses of pipe,?

Reply (1): Yes.

Question (2): Will the Committee consider revising Note (17) to permit use of filler metal in thelarger sizes and wall thicknesses of ASTM B 337 pipe?

Reply (2): No, unless ASTM revises B 337 to require welding procedures and welders or weldingoperators to be qualified in accordance with Section IX of the ASME Boiler and Pressure Vessel Code.


Subject:

Date Issued:

File:

Scope, Hot Oil Heating System Piping

June 19, 1986

B31-86-007

Question: Which B31 Code Section is applicable to a hot oil distribution system used to provideheat to vinyl manufacturing equipment?

Reply: ANSI/ASME B31.3 is the applicable Code.

39

17908

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